Heinricii august bernthsen



UNrrsn STATES PATENT 0FFICE.-

HEINRICH AUGUST BERNTHSEN, OF MANNHEIM, AND PAUL JULIUS, OF LUDWIGSHAFEN, ASSIGNORS TO THE BADISOHE ANILIN AND SODA FABRIK, OF LUDWIGSHAFEN, GERMANY.

SPECIFICATION forming part of Letters Patent No. 521,096, dated June 5, 18.94.

Application filed March 30, 1894. Serial No. 505,740. (Specimens) Patented in Germany January 9, 1893, No. 75,469 in England February 6, 1893, No. 2,614, and in France May 15, 1898,1Io. 227,892. 1

To all whom it may concern.-

Be it known that we, HEINRICH AUGUST BERNTHSEN, a subject of the King of Prussia,

residing at Mannheim, in the Grand Duchy of Baden, and PAUL JULIUS, a subject of the Emperor of Austria-Hungary, residing at Ludwigshafeh, in the Kingdom of Bavaria, Empire of Germany, have invented new and useful Improvements in the Manufacture of a New Substantive Violet Dye, (for which patents have been obtained in Germany, No. 7 5,469, datedjJanuary 9, 1893; in England, No. 2,614, dated February 6, 1893, and in France, No. 227,892, dated May 15, 1893,) of which the following is a specification.

Our invention relates to the manufacture of a new violet dye which fixes itself on cotton goods and the like from a boiling neutral or alkaline bath without the aid of a mordant.

Our new dye derives from a new amidonapthol-sulfoacid, which we have invented and which is obtained by melting with a caustic alkali the 2et2- naphthylamindisulfoacid (Armstrong and Wynne, Proceedings of the Chemical Society, 1890, page 128) at a temperature of about 170 to 195 centigrade as more fully described in the French patent, No. 227,892, of February 13, 1898. This new acid has the constitution represented by the formula:

and the new dye is obtained by combining two molecular proportions thereof with one covered that it can be diazotized on the fiber by treating the goods dyed with it with nitrous acid and that the resulting compound will then combine with other dyestuif-components yielding various very fast shades of color. The components which can be used in this way are for instance the naphthols, resorcinol, meta-phenyleneand toluylene-diamin, ethyl-beta-naphthyl-amin, alpha-amido-betanaphthol ether, para-amido diphenyl amin and chrysoidin.

Thefollowing example will serve to illustrate the manner in which our invention can be carried into practical effect and our new dye obtained. The parts are by weight.

Example: Prepare a solution of tetrazodiphenyl from about eighteen and a half parts of benzidin in the well-known way and pour the tetrazo-solution into an ice-cold dilute soda-solution, and then immediately add a solution of about forty eight parts of the new amido-naphtholmono sulfoacid. Stir for about twelve hours, filter, press and dry.

Our new dyestulf occurs as a dark powder readily soluble in both hot and cold water giving claret-red solutions, it is slightly soluble in alcohol, practically insoluble in benzene, ether and ligro'l'ne, it gives a beautiful blue solution in concentrated sulfuric acid and on diazotizing on the fiber the latter assumes a grayish-greenish color changing on treatment with the components hereinbefore mentioned to beautiful and exceedingly fast deep shades.

The new dyestuff in the form of soda salt possesses the constitution represented bythe formula:

Now what we claim as new, and desire to secure by Letters Patent, is

As a new article of manufacture the new coloring-matter which can be derived from tetmzo-diphenyl and the 2.4'.2-ainidonaphthol-sulfoacid and in the form of soda salt possesses the constitution:

and which occurs in the form of a dark powder which is readily soluble in hot and cold water giving claret red solutions, slightly soluble in alcohol, practicably insoluble in HEINRICH AUGUST BERNTIISEN. PAUL JULIUS.

Witnesses:

ERNEST F. EHRHARDT, ADOLPI-I REUTLINGER. 

